In order to submersible pump in the use of the best economic benefits to ensure its safety and reliability and extend the service life, before the purchase of submersible pumps, should be based on the specific conditions of use (especially the use of water and the size of the required flow And the level of head) to choose the right submersible pump to make it a reasonable package. â—† Type Selection (1) When using the submersible pump, the size of the pump should be determined according to the diameter of the well (100mm, 105mm, 200mm, 250mm, 300mm, etc.) , Head choose its specific specifications. (2) It is preferable to use pump type submersible pumps such as QY type, Q type and QS type when it is used for water intake in general clean water places such as shallow wells, rivers and lakes. (3) For local drainage, the water quality contains small particles of solid impurities, such as flood control and drainage, construction, farm purification, the selection of QX-type, QDX-type submersible pump more appropriate pump. (4) for the transport of sewage containing solid particles and dirt, especially with large particles of sewage sewage, should be selected WQ sewage submersible sewage pump. (5) When used for coal mining and other mining to transport sewage containing solid particles of dirt, pulverized coal, etc., must be used explosion-proof explosion-proof mining submersible pump, do not use the general submersible pump, so as to avoid Danger of explosion. â—† Specifications Selection of different specifications of the submersible pump has a different range of use. The flow rate and lift specified on the nameplate of any submersible pump are rated conditions for use with this submersible pump and are generally the best point to use. In use, with the flow, lift changes, the efficiency of submersible pumps and motor power also changes accordingly, the economy and reliability of the submersible pump to a certain extent. If the lift used is too low, the motor will overheat, long run even burn the motor; if the use of the lift is too high, the pump flow will be smaller, lower efficiency. Submersible pump generally 0.7 times to 1.2 times the normal flow rate of the normal operation. Therefore, the user is required to select appropriate submersible pump and use, you must consider the appropriate range of use, especially for high-lift submersible pumps, do not make it in the low lift point of operation, or both waste electricity, it may damage diving Electric pump.